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| |
| <div class="col-md-8 col-md-offset-2"> |
| <p>This is the second Apache release of DistributedLog and the first release as a sub-project of Apache BookKeeper!</p> |
| |
| <p>The 0.5.0 release upgrades BookKeeper from Twitter <code class="highlighter-rouge">4.3.7-TWTTR-OSS</code> version to the official Apache <code class="highlighter-rouge">4.5.0</code> version. |
| It is a big milestone in Apache BookKeeper & DistributedLog community, converging the development efforts for |
| both communities and moving the DistributedLog development on the official Apache bookkeeper release.</p> |
| |
| <p>Apache DistributedLog users are encouraged to upgrade to 0.5.0. The technical details of this release are summarized |
| below.</p> |
| |
| <h2 id="highlights">Highlights</h2> |
| |
| <h3 id="bookkeeper-version-upgrade">BookKeeper Version Upgrade</h3> |
| |
| <p>The main change in 0.5.0 is BookKeeper version upgrade. We upgraded the BookKeeper version from Twitter’s <code class="highlighter-rouge">4.3.7-TWTTR-OSS</code> |
| to the official <a href="http://bookkeeper.apache.org/docs/4.5.0/overview/releaseNotes/">Apache BookKeeper <code class="highlighter-rouge">4.5.0</code></a> version. This upgrade brings in BookKeeper security feature and performance improvement (such as netty 4 upgrade). |
| The upgrade should be straightforward, because there isn’t any backward compatible issue.</p> |
| |
| <h3 id="change-twitter-future-to-java-future">Change Twitter Future to Java Future</h3> |
| |
| <p>Prior to 0.5.0, the DistributedLog API heavily depends on Twitter Future library and other scala dependency. In 0.5.0, we change |
| the twitter future API to a separate module and replace the core API with Java8 CompletableFuture. It reduces the dependencies introduced |
| by Scala and also avoid maintaining multiple versions for different scala versions.</p> |
| |
| <h3 id="better-buffermemory-management">Better buffer/memory management</h3> |
| |
| <p>After upgrading to BookKeeper 4.5.0, we update the buffer and memory management in DistributedLog to leverage netty’s buffer management. |
| It reduces object allocation, memory copies and improves the latency because less jvm garbage is produced.</p> |
| |
| <h2 id="full-list-of-changes">Full list of changes</h2> |
| |
| <h3 id="jira">JIRA</h3> |
| |
| <p>####Sub-task</p> |
| <ul> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-208">DL-208</a>] - Update release notes about the download location |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-209">DL-209</a>] - Update build script to build DistributedLog website under `bookkeeper.apache.org/distributedlog` |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-210">DL-210</a>] - Update DL mailing lists |
| </li> |
| </ul> |
| |
| <p>####Bug</p> |
| <ul> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-19">DL-19</a>] - Can't compile thrift file |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-124">DL-124</a>] - Use Java8 Future rather than twitter Future |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-128">DL-128</a>] - All TODO items should have jira tickets. |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-195">DL-195</a>] - Apache Rat Check Failures on DISCLAIMER.bin.txt |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-206">DL-206</a>] - Delete log doesn't delete log segments |
| </li> |
| </ul> |
| |
| <p>####Improvement</p> |
| <ul> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-204">DL-204</a>] - Bump libthrift to latest version for distributedlog-core |
| </li> |
| </ul> |
| |
| <p>####Task</p> |
| <ul> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-2">DL-2</a>] - DistributedLog should work with the official apache bookkeeper |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-81">DL-81</a>] - Build the distributedlog release procedure |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-82">DL-82</a>] - Automatically build and update the website |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-199">DL-199</a>] - Be able to support filesystem-path like name |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-205">DL-205</a>] - Remove StatusCode dependency on DLException |
| </li> |
| <li>[<a href="https://issues.apache.org/jira/browse/DL-207">DL-207</a>] - DL Graduation Item |
| </li> |
| </ul> |
| |
| <h3 id="github">Github</h3> |
| |
| <ul> |
| <li><a href="https://github.com/apache/distributedlog/milestone/1?closed=1">https://github.com/apache/distributedlog/milestone/1</a></li> |
| </ul> |
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